chapter  9
14 Pages

EFFECT OF AMINO NAPHTHALENE SULFONIC ACID NATURE ON THE STRUCTURE AND PHYSICAL PROPERTIES OF THEIR COPOLYMERS WITH ANILINE

Summary ............................................................................................... 218 9.1 Introduction .................................................................................. 218 9.2 Experimental ................................................................................ 219 9.3 Results and Discussion ................................................................ 221 9.4 Conclusions .................................................................................. 229 Acknowledgments ................................................................................. 229 Keywords .............................................................................................. 229 References ............................................................................................. 230

SUMMARY

Paper studied the physical properties and structure of the copolymers based on polyaniline (PANI) and amino naphthalene sulfonic acids (ANSA) with different mutual position of substituents in naphthalene ring, namely, 1-аmino-naphthalene-4-sulfonic acid (1,4-АNSA), 1-amino-naphthalene8-sulfonic acid (1,8-ANSA), 1-amino-naphthalene-5-sulfonic acid (1,5ANSA) and 1-amino-2-naphthol-4-sulfonic acid. It shown that structure of isomeric ANSA has a significant effect on the thermal stability, magnetic susceptibility and conductivity of the PANI-ANSA systems. The field dependence of magnetization confirms that obtained copolymers are the typical paramagnetic materials. In the interval of T = 4.2-300 K all samples demonstrate a stable EPR signal with g-value of 2.0025-2.0034 which is typically for aromatic cation-radicals (polarons). A highest concentration of paramagnetic centers is observed for the (PANI-1,4-ANSA) copolymer (1 : 1) when interaction between ANSA and PANI occurs in ortho-position. In the case of 1,8-ANSA the para-coupling is prevails which causes a higher conductivity and thermal stability of copolymer.